# CVE-2026-40973

## Summary

- **CVE ID:** CVE-2026-40973
- **Severity:** HIGH
- **CVSS Score:** 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-377
- **Published:** Apr 27, 2026
- **Last Modified:** Apr 29, 2026

## Description

A local attacker on the same host as the application may be able to take control of the directory used by `ApplicationTemp`. When `server.servlet.session.persistent` is set to `true` and the attack persists across application restarts, this may allow the attacker to read session information and hijack authenticated users or deploy a gadget chain and execute code as the application's user.

Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); predictable temp directory / `ApplicationTemp` ownership verification. Versions that are no longer supported are also affected per vendor advisory.

## Affected Products

- Spring — Spring Boot (4.0.0)
- Spring — Spring Boot (3.5.0)
- Spring — Spring Boot (3.4.0)
- Spring — Spring Boot (3.3.0)
- Spring — Spring Boot (2.7.0)

## References

- [CNA](https://spring.io/security/cve-2026-40973)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._